Question

我有一个小问题，我可以荒谬地解决不了自己。

我有一个简单的数据框，我想用ggplot2绘制。当我使用变量 weight 作为因子时，我得到x轴中的所有值，s。 plot 2 ，但不是当我将它用作整数时，s。 plot 1 。但是，我想使用geom_smooth，它似乎仅适用于 plot 1 ，但不适用于 plot 2 ，其中 weight 是一个因素。

如何在ggplot2中获取图表，其中显示重量的所有值以及geom_smooth函数？

考虑this示例文件：

require(ggplot2)

x <- get.url(https://dl.dropboxusercontent.com/u/109495328/example.csv)
app_df <- read.csv(x, header=T, sep = ",", quote = "", stringsAsFactors = FALSE, na.strings = "..")     
colnames(app_df) <- c("Date", "Weight")

date <- as.Date(strptime(app_df$Date, "%d.%m.%Y"))
weight <- app_df$Weight
df <- na.omit(data.frame(date,weight))

# plot 1 (only few values indicated in x axis)
ggplot(df, aes(date,weight)) +
  geom_point() +
  geom_line(aes(group = "1")) +
  geom_smooth(method = "lm")

# plot 2 (no smooth function)
ggplot(df, aes(date,as.factor(weight))) +
  geom_point() +
  geom_line(aes(group = "1")) +
  geom_smooth(method = "lm")

Answer 1

这就是你想要的吗？

require(ggplot2)

x <- url("https://dl.dropboxusercontent.com/u/109495328/example.csv")
app_df <- read.csv(x, header=T, sep = ",", quote = "", stringsAsFactors = FALSE, na.strings = "..")     
colnames(app_df) <- c("Date", "Weight")

date <- as.Date(strptime(app_df$Date, "%d.%m.%Y"))
weight <- app_df$Weight
df <- na.omit(data.frame(date,weight))

# plot 1 (only few values indicated in x axis)
ggplot(df, aes(date,weight)) +
  geom_point() +
  geom_line(aes(group = "1")) +
  geom_smooth(method = "lm")

# plot 2 (no smooth function)
ggplot(df, aes(date,as.numeric(as.factor(weight)))) +
  geom_point() +
  geom_line(aes(group = "1")) +
  geom_smooth(method = "lm")

ggplot2 geom_smooth，变量为因子

1 个答案: